Move direct use of VideoCapturer::VideoAdapter to VideoSinkWants.

webrtc/media/base/videosourceinterface.h

Index: webrtc/media/base/videosourceinterface.h
diff --git a/webrtc/media/base/videosourceinterface.h b/webrtc/media/base/videosourceinterface.h
index 14624585432194c74bec680c6f18befb56ce79f5..9bd32a2588929beaea063c3c19c1b9f294e4db70 100644
--- a/webrtc/media/base/videosourceinterface.h
+++ b/webrtc/media/base/videosourceinterface.h
@@ -11,6 +11,8 @@
 #ifndef WEBRTC_MEDIA_BASE_VIDEOSOURCEINTERFACE_H_
 #define WEBRTC_MEDIA_BASE_VIDEOSOURCEINTERFACE_H_
 
+#include <limits>
+
 #include "webrtc/media/base/videosinkinterface.h"
 #include "webrtc/base/callback.h"
 
@@ -27,6 +29,9 @@ struct VideoSinkWants {
   // Tells the source whether the sink wants frames with rotation applied.
   // By default, the rotation is applied by the source.
   bool rotation_applied = true;
+
+  // Tells the source the maximum number of pixels the sink wants.
+  int max_number_of_pixels = std::numeric_limits<int>::max();
 };
 
 template <typename VideoFrameT>